The boat was sailing against the stream of the river at a speed of 10 km per hour, it swam for 45 minutes
| January 20, 2021 | education
The boat was sailing against the stream of the river at a speed of 10 km per hour, it swam for 45 minutes and its engine broke down, and it carried it back in 3 hours. find the speed of the river?
The sought-for unspecified river flow velocity is determined by the conditional variable “Y”.
At the second stage, taking into account the speed formula and applying the example data, we form the following equation: (45/60) x (10 – Y) = 3V.
As a result of solving the obtained equation, we have 0.75 x (10 – Y) = 3Y or 7.5 – 0.75Y = 3Y or 7.5 = 3Y + 0.75Y or 3.75Y = 7.5 or Y = 7, 5 / 3.75 = 2 kilometers per hour.
Answer: the river flows at a speed of 2 kilometers per hour.
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